CVE-2023-34319: Linux: buffer overrun in netback due to unusual packet
Vulnerability summary
CVE-2023-34319 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 21.3% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 44 · Related 35Timeline
- 22-09-2023PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.29%
Chance of exploitation in the next 30 days
Percentile
21%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.29% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu104 products
- linux< 4.4.0-246.280 | < 4.15.0-219.230 | < 5.4.0-165.182 | < 5.15.0-87.97
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 4.4.0-1124.130 | < 4.4.0-1162.177 | < 4.15.0-1162.175 | < 5.4.0-1112.121 | < 5.15.0-1048.53
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.52-1 | < 6.4.11-1
- debian_linuxEOL10.0
Alpine1 product
- xen≥ 3.2.0 (No fix recorded)
Linux1 product
- linux_kernel≥ 4.9.336, < 4.10 | ≥ 4.14.302, < 4.14.321 | ≥ 4.19.269, < 4.19.290 | ≥ 5.4.227, < 5.4.252 | ≥ 5.10.159, < 5.10.189 | ≥ 5.15.83, < 5.15.125 | ≥ 6.1.13, < 6.1.44 | ≥ 6.2, < 6.4.9
Xen1 product
- xen≥ 3.2.0 (No fix recorded)
5 vendors · 109 products
References
32 links- packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.htmlThird Party AdvisoryVDB Entry
lists.debian.org/debian-lts-announce/2024/01/msg00004.htmlThird Party Advisory- security.netapp.com/advisory/ntap-20240202-0001/Third Party Advisory